more when you can use less? ♪ super durable, super absorbent, super clean. bounty. the one-sheet clean picker-upper. uniquely preserved how? >>> a human body that should be decomposing on display and you knowingly preserved. how do they preserve the bodies in the plastic man exhibit? that's tonight's good question. >>> the process has been controversial since its development in 1977 by german -- and his wife. >> they invented the process of. before they did it, this was not even available. >> the process is called -- the conversion of a human corpse to a scientific display. the director has seen the process firsthand. he says it begins with full he percent into formaldehyde. they do it with they put you in a big tube with all these chemicals in there. >> then just as the word would indicate, the bodies are injected with a special plastic. >> before they put the plastic in, they have to put you in position. the kind of position you see here, then they inject all this plastic. it gets hardened and it stays forev